Jambura, Patrick L.

Julia, Türtscher

Jürgen, Kriwet

Marramà, Giuseppe

René, Kindlimann

English

Institutional Research Information System University of Turin

See discussions, stats, and author profiles for this publication at: https://www.researchgate.net/publication/328968537The evolutionary history of the tiger shark, Galeocerdo cuvierConference Paper · November 2018CITATIONS05 authors, including:Some of the authors of this publication are also working on these related projects:Reappraisal of two key Fossil-Lagerstätten in Scaglia deposits of northeastern Italy in the context of Late Cretaceous climatic variability: a multidisciplinary approachView projectEvolutionary history of pycnodontiform fishes (Osteichthyes, Neopterygii) View projectJulia TürtscherUniversity of Vienna4 PUBLICATIONS   0 CITATIONS   SEE PROFILEPatrick Leopold JamburaUniversity of Vienna16 PUBLICATIONS   1 CITATION   SEE PROFILEGiuseppe MarramàUniversity of Vienna49 PUBLICATIONS   210 CITATIONS   SEE PROFILERené Kindlimann10 PUBLICATIONS   80 CITATIONS   SEE PROFILEAll content following this page was uploaded by Jürgen Kriwet on 15 November 2018.The user has requested enhancement of the downloaded file. The evolutionary history of the tiger shark, Galeocerdo cuvier  Julia Türtscher1, Patrick L. Jambura1, Giuseppe Marramà1, René Kindlimann2, Jürgen Kriwet1  1University of Vienna, Department of Palaeontology, Vienna, Austria. 2Zürichstrasse 58, 8607 Aathal-Seegräben/ZH, Switzerland. Email: tuertscher.julia@gmail.com   The tiger shark Galeocerdo cuvier, one of the largest predatory sharks in today’s oceans, has distinctively notched and serrated teeth, which allow it to cut out pieces of its prey and even crack open shells of sea turtles. It is the only extant species of this genus and has a fossil record extending back at least into the late Miocene (~5 Ma). The fossil record of the genus, however, reaches back even further into the early Eocene (~56 Ma). During the last 200 years, more than sixty fossil species were described based on isolated teeth, with some species even based upon a single tooth. About twenty of these species are still considered valid, among them the well-known Miocene tiger shark Galeocerdo aduncus. Theories about the origin of the living tiger shark, Galeocerdo cuvier, his direct ancestors and closest extinct relatives were frequently discussed in the past years, but the history of this exceptional shark still remains obscure.  We compared nearly five hundred teeth of several tiger shark species using geometric morphometrics to investigate significant morphological variations and to verify the validity of the examined species. The clustering of the specimens on the morphospace clearly demonstrated the presence of different species, as well as an ontogenetic shift of tooth morphology in extant juvenile and adult tiger sharks. Our results provide new information about the ambiguous evolutionary history of the tiger shark and suggest that the origin of the extant species Galeocerdo cuvier lies back more than twice as long as previously thought. These data greatly augment our understanding of the complex evolutionary history of this iconic shark lineage, which has been very successful for the last 56 million years but is facing many threats today due to human activities and therefore should be a priority target for future conservation efforts.          European Elasmobranch Association 22nd annual conference 12 – 14 October, Peniche – Portugal Book of Abstracts POLICY AND CONSERVATION FOR A BRIGHTER BLUE FUTURE   European Elasmobranch Association 22nd annual conference 12 – 14 October, Peniche – Portugal Organized by Associação Portuguesa para o Estudo e Conservação de Elasmobrânquios & Escola Superior de Turismo e Tecnologia do Mar do Instituto Politécnico de Leiria. View publication stats

The evolutionary history of the tiger shark, Galeocerdo cuvier

https://iris.unito.it/bitstream/2318/1788390/1/tuertscher_etal_2018_eea_galeocerdo.pdf

The evolutionary history of the tiger shark, Galeocerdo cuvier

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